Solar Panel System GuideSilfab and Qcells both target residential rooftops but on different efficiency tiers and warranty terms. This page compares their documented numbers and declares no winner.
How to read this comparison
Every figure below is quoted from the manufacturer datasheet for a specific model. Efficiency and wattage are stated at standard test conditions, the same lab benchmark for both, so the numbers compare like for like. Warranty terms are worth reading closely because manufacturers split product and performance coverage differently. Numbers change as manufacturers release new model years, so always confirm against the current datasheet for the exact model a quote lists.
Silfab Prime SIL-410 HC+ (from the Silfab and EnergySage listings)
Silfab lists the Prime SIL-410 HC+ at power classes of 400 and 410 watts with monocrystalline cells. Module efficiency reaches 20.7 percent for the 410 watt class, and Silfab engineers the Prime line for North America.
On warranty, the listing shows a 25 year materials warranty and a 30 year performance warranty.
Qcells Q.TRON BLK M-G2+ (from the Qcells datasheet)
Qcells lists the Q.TRON BLK M-G2+ with N-type Q.ANTUM NEO cells, a power class of 415 to 440 watts, and module efficiency up to 22.5 percent.
On warranty, Qcells lists a 25 year product warranty and a 25 year performance warranty, guaranteeing at least 90.58 percent of nominal power at year 25.
Where they differ on paper
On efficiency, Qcells lists the Q.TRON at up to 22.5 percent while Silfab lists the SIL-410 HC+ at 20.7 percent. Qcells also lists a higher power class, 415 to 440 watts against Silfab's 400 to 410 watts.
On warranty, Silfab lists a 30 year performance term against the Qcells 25 year performance term, while both list a 25 year product or materials warranty. Silfab also states its Prime line is engineered for North America. These are the documented figures, not a verdict.